list = [123,124,125,126]

list[:] = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]

list[4:] = [234,235,236,241,12,13,14,15]

list[6:7] = [6,7,8,9,10]

print list[0]+list[1]+list[2]+list[3]+list[6]+list[7]+list[8]+list[15]
